Sarthaks Test
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Although Zirconium belongs to 4d transition series and Hafnium to 5d transition series even then they show similar physical and chemical properties because___________. 

(i) both belong to d-block. 

(ii) both have same number of electrons. 

(iii) both have similar atomic radius. 

(iv) both belong to the same group of the periodic table.

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(iii) both have similar atomic radius. 

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